Citazione Stile APA (7a Edizione)

Bird, W. (1991). The orgin of species revisited: The theories of evolution and of abrupt appearance. Regency.

Citazione stile Chigago Style (17a edizione)

Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Tennessee: Regency, 1991.

Citatione MLA (9a ed.)

Bird, W.R. The Orgin of Species Revisited: The Theories of Evolution and of Abrupt Appearance. Regency, 1991.